Please see the attached file.
5/139. The sliding collar moves up and down the shaft, causing an oscillation of crank OB. If the velocity of A is not changing as it passes the null position where AB is horizontal and OB is vertical, determine the angular acceleration of OB in that position.© BrainMass Inc. brainmass.com April 3, 2020, 5:41 pm ad1c9bdddf
It finds the angular acceleration due to the sliding collar. The solution is detailed and was rated '5/5' by the student who originally posted the questions.